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- Evidence of large T
regression in most pts,
already during the first half
of the treatment
- T2-weighted MRI suitable
for assessing tumour
regression and GTV/CTV
contouring
Adaptive RT: T regression as seen by MRI
Planning
MRI_GTV: 28cc
- Defining GTV_boost as
the fraction of rectum
corresponding to visible
tumor at half-RT MRI
- Dose/fractionation ?
- Margins ?
Mid-therapy (fr 9)
MRI_GTV: 7cc